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首页> 外文期刊>The Journal of Prosthetic Dentistry >Mechanical properties of cobalt-chromium 3-unit fixed dental prostheses fabricated by casting, milling, and additive manufacturing
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Mechanical properties of cobalt-chromium 3-unit fixed dental prostheses fabricated by casting, milling, and additive manufacturing

机译：通过铸造，研磨和添加剂制造制造的钴 - 铬3单元固定牙科假体的机械性能

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Statement of problemNew additive manufacturing techniques for nonprecious alloys have made the fabrication of metal-ceramic fixed partial dentures (FPDs) less expensive and less time-consuming. However, whether the mechanical properties produced by these techniques are comparable is unclear. PurposeThe purpose of this in?vitro study was to evaluate the mechanical properties of cobalt-chromium frameworks for FPDs fabricated by 3 different techniques. Material and methodsThirty frameworks for 3-unit FPDs were fabricated by traditional casting, computer-aided design and computer-aided manufacturing (CAD-CAM) milling, and selective laser melting (SLM), with n=10 in each group. The frameworks were weighed, and distal and mesial connector areas measured. The frameworks were cemented and loaded centrally (0.5 mm/s) until deformation above 1 mm occurred. Stiffness was measured as the slope of the axis between 500 and 2000 N. Microhardness was measured on sectioned specimens by Vickers indentation. The microstructure was also analyzed by scanning electron microscopy. One-way ANOVA with Tukey post hoc analysis was used to compare the groups (α=.05). ResultsThe framework design differed among the groups, making a comparison of strength impossible. The milled frameworks appeared bulky, while the cast and SLM frameworks were more slender. Statistically significant differences were found in microhardness, stiffness, wall thickness, weight, and connector size (P<.05), and a significant correlation was found between hardness and stiffness (–0.4,P<.005). ConclusionsFabrication method affects the design, stiffness, microhardness, and microstructure of cobalt-chromium FPD frameworks. The SLM frameworks were stiffer and harder than the cast and milled specimens.
机译：非骄傲合金的问题制造技术的问题表明已经制造了金属陶瓷固定部分假牙（FPD）的制造更便宜且较少耗时。然而，通过这些技术产生的机械性能是不明朗的。目的在玻术上的目的是评价钴 - 铬框架的机械性能，用于3种不同技术制造的FPD。通过传统的铸造，计算机辅助设计和计算机辅助制造（CAD-CAM）铣削和选择性激光熔化（SLM）制造了3单元FPD的材料和方法框架，以及每组中的N = 10。称重框架，测量远端和微观连接器区域。将框架粘合并集中装载（0.5 mm / s），直至发生以上1mm以上的变形。测量刚度，因为在500至2000n的轴线之间的斜率在通过维氏压痕测量段标本上测量微硬度。还通过扫描电子显微镜分析微观结构。使用Tukey Post Hoc分析的单向ANOVA进行比较组（α= .05）。结果框架设计在群体中有所不同，比较不可能的力量。铣削框架出现了笨重，而演员和SLM框架更加纤细。在微硬度，刚度，壁厚，重量和连接器尺寸（P <.05）中发现了统计学显着的差异，并且在硬度和刚度之间发现了显着的相关性（-0.4，p <.005）。结论特收方法影响钴 - 铬FPD框架的设计，刚度，显微硬度和微观结构。 SLM框架比铸造和研磨的标本更硬。

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    Marit ?ilo; Harald Nesse; Odd Johan Lundberg; Nils Roar Gjerdet;

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    Department of Clinical Dentistry Faculty of Medicine University of Bergen;

    Dental Clinics Department of Clinical Dentistry Faculty of Medicine University of Bergen;

    Department of Clinical Dentistry Faculty of Medicine University of Bergen;

    Department of Clinical Dentistry Faculty of Medicine University of Bergen;

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  • 正文语种 eng
  • 中图分类 口腔科学;
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